People sometimes picture everything swelling with the Universe, atoms and the Solar System included. Not so: wherever gravity or electric forces dominate, as in an atom, a planet or a galaxy, matter stays bound together. Expansion only pulls apart things too far away to be bound, meaning groups and clusters of galaxies drifting from one another.
A large share of Earth's water molecules formed in the interstellar cloud that existed before the Sun was even born, more than 4.6 billion years ago. You are literally drinking a cosmic fossil.
By day, the Martian sky looks butterscotch because of fine dust hanging in the air. But at dusk, those same grains scatter blue light forward, creating a bluish glow around the Sun. Rovers have photographed these blue sunsets: the exact reverse of what we see on Earth.